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arXiv 2025年

作者： Lu, Chen Zhang, Ming Pan, Zhiming Wu, Congjun Yang, Fan School of Physics Hangzhou Normal University Hangzhou311121 China Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China Department of Physics Xiamen University Fujian Xiamen361005 China New Cornerstone Science Laboratory Department of Physics School of Science Westlake University Zhejiang Hangzhou310024 China Institute for Theoretical Sciences Westlake University Zhejiang Hangzhou310024 China Key Laboratory for Quantum Materials of Zhejiang Province School of Science Westlake University Zhejiang Hangzhou310024 China Institute of Natural Sciences Westlake Institute for Advanced Study Zhejiang Hangzhou310024 China School of Physics Beijing Institute of Technology Beijing100081 China

The bilayer nickelate La3Ni2O7 under pressure has recently emerged as a promising system for high-Tc superconductivity (SC). In this work, we investigate the fate of the SC properties in La3Ni2O7 under pressure, focusing on the effects of structural deformation and apical oxygen vacancies. Employing a low-energy effective t-J-J̝ model for the 3dx2−y2 orbitals within the slave-boson mean-field approach, we demonstrate that the SC pairing strength is significantly enhanced in the high-pressure tetragonal I4/mmm phase compared to the ambient pressure orthorhombic Amam phase. Furthermore, by simulating random configurations of apical oxygen vacancies, we show that oxygen vacancies suppress both pairing strength and superfluid density. These results underscore the critical role of pressure and oxygen stoichiometry in tuning the SC of La3Ni2O7, providing key insights into optimizing its high-Tc behavior. Copyright © 2025, The Authors. All rights reserved.

关键词： Oxygen vacancies

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Nuclear β-decay half-life predictions and r-process nucleosynthesis using machine learning models

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Physical Review C 2025年第3期111卷 034321-034321页

作者： Amir Jalili Feng Pan Y. A. Luo Jerry P. Draayer Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou 310018 China School of Physics Nankai University Tianjin 300071 People's Republic of China Department of Physics Liaoning Normal University Dalian 116029 People's Republic of China Department of Physics and Astronomy Louisiana State University Baton Rouge Louisiana 70803-4001 USA

This study investigates the predictive capabilities of machine learning models in nuclear β-decay half-life predictions and their application to r-process nucleosynthesis. The research explores the intricacies of statistical modeling using support vector machines (SVM), focusing on understanding the learning and prediction of various nuclear configurations and features that influence β-decay half-lives. By considering a comprehensive dataset spanning from light to heavy mass nuclei, the SVM demonstrates remarkable accuracy in reproducing experimentally known half-lives across diverse nuclear structures. Evaluations reveal the effectiveness of this model across different nuclear classes, with notable improvements observed in even-even nuclei predictions. Furthermore, this study demonstrates the extrapolative capabilities of SVM predictions in solar r-process nucleosynthesis, emphasizing its ability to accurately predict r-process abundances. The SVM model, particularly when utilizing the radial basis function kernel, exhibits strong agreement with experimental data, providing valuable insights into the behavior of highly neutron-rich nuclei. These findings underscore the significance of machine learning as a powerful tool in nuclear physics research, offering promising avenues for advancing our understanding of β-decay processes and r-process nucleosynthesis.

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Necessity of orthogonal basis vectors for the two-anyon problem in a one-dimensional lattice

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Communications in Theoretical Physics 2024年第12期76卷 60-72页

作者： Cuicui Zheng Jiahui Xie Ming Zhang Yajiang Chen Yunbo Zhang Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China

Few-body physics for anyons has been intensively studied within the anyon-Hubbard model,including the quantum walk and Bloch oscillations of two-anyon ***,theoretical and experimental simulations of two-anyon states in a one-dimensional lattice have been carried out by expanding the wavefunction in terms of non-orthogonal basis vectors,resulting in nonphysical degrees of *** the present work,we deduce finite difference equations for the two-anyon state in a one-dimensional lattice by solving the Schr?dinger equation with orthogonal and complete basis *** an orthogonal scheme gives all the orthogonal physical eigenstates,while the conventional(non-orthogonal)method produces many nonphysical redundant eigensolutions whose components violate the anyonic commutation *** dynamical property of the two-anyon states in a sufficiently large lattice is investigated and compared in both the orthogonal and conventional *** initial states with two anyons at the same site or two(next-)neighboring sites,we observe the same dynamical behavior in both schemes,including the revival probability,probability density function and two-body *** other initial states,the conventional scheme produces erroneous states that no longer obey the anyonic *** period of Bloch oscillations in the pseudo-fermionic limit has been found to be twice that in the bosonic limit,while these oscillations disappear at other statistical *** findings are vital for quantum simulations of few-body anyonic physics in lattice models.

关键词： anyon-Hubbard model quantum walk Bloch oscillations two-anyon states quantum simulation

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Collisional dynamics of symmetric two-dimensional quantum droplets

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Frontiers of physics 2022年第6期17卷 203-209页

作者： Yanming Hu Yifan Fei Xiao-Long Chen Yunbo Zhang Institute of Theoretical Physics and State Key Laboratory of Quantum Optics and Quantum Optics Devices Shanxi UniversityTaiyuan 030006China Department of Physics and Key Laboratory of Optical Field Manipulation of Zhejiang Province Zhejiang Sci-Tech UniversityHangzhou 310018China

The collisional dynamics of two symmetric droplets with equal intraspecies scattering lengths and particle number density for each component is studied by solving the corresponding extended Gross–Pitaevskii equation in two dimensions by including a logarithmic correction term in the usual contact *** find the merging droplet after collision experiences a quadrupole oscillation in its shape and the oscillation period is found to be independent of the incidental momentum for small *** increasing collision momentum the colliding droplets may separate into two,or even more,and finally into small pieces of *** these dynamical phases we manage to present boundaries determined by the remnant particle number in the central area and the damped oscillation of the quadrupole mode.A stability peak for the existence of droplets emerges at the critical particle number Nc≃48 for the quasi-Gaussian and flat-top shapes of the droplets.

关键词： ultracold atoms quantum droplets collisions

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quantum dynamics on a lossy non-Hermitian lattice

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Chinese Physics B 2021年第2期30卷 64-70页

作者： Li Wang Qing Liu Yunbo Zhang Institute of Theoretical Physics State Key Laboratory of Quantum Optics and Quantum Optics DevicesCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China Key Laboratory of Optical Field Manipulation of Zhejiang Province and Physics Department of Zhejiang Sci-Tech University Hangzhou 310018China

We investigate quantum dynamics of a quantum walker on a finite bipartite non-Hermitian lattice,in which the particle can leak out with certain rate whenever it visits one of the two *** walker initially located on one of the non-leaky sites will finally totally disappear after a length of evolution time and the distribution of decay probability on each unit cell is *** one regime,the resultant distribution shows an expected decreasing behavior as the distance from the initial site ***,in the other regime,we find that the resultant distribution of local decay probability is very counterintuitive,in which a relatively high population of decay probability appears on the edge unit cell which is the farthest from the starting point of the quantum *** then analyze the energy spectrum of the non-Hermitian lattice with pure loss,and find that the intriguing behavior of the resultant decay probability distribution is intimately related to the existence and specific property of the edge states,which are topologically protected and can be well predicted by the non-Bloch winding *** exotic dynamics may be observed experimentally with arrays of coupled resonator optical waveguides.

关键词： quantum walk non-Hermitian lattice dissipations edge states

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Enhancement and architectural optimization of polyvinylidene fluoride-based solid polymer electrolytes for advanced solid-state lithium-metal batteries

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Journal of Power Sources 2025年 647卷

作者： Dongbo Yang Xiaoping Chen Changzheng Chen Weiheng Chen Zhuolin Huang Heyuan Wang Shanshan Chen Zhongqing Jiang School of Mechanical Engineering Shenyang University of Technology Shenyang 110870 PR China Department of Mechanical Engineering Ningbo University of Technology Ningbo 315336 PR China Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou 310018 PR China

Energy storage devices have become an integral aspect of both industrial production and everyday life, with the rapidly escalating demand for batteries that possess high energy-density and robust safety features. This paper delves into the inherent properties of diverse solid-state electrolytes (SSEs) employed in solid-state lithium-metal batteries (SSLMBs), which are distinguished by their high energy-density, with the objective of assessing their suitability for application in SSLMBs. Among the various types of SSEs, polyvinylidene fluoride (PVDF)-based solid polymer electrolytes (SPEs) emerge as one of the most promising candidates, which has received much attention for its wide electrochemical window, good thermal and chemical stability, and ability to be better adapted to lithium-metal anode. Furthermore, optimizing the ionic conductivity of the SSEs, improving the wettability at the electrode/electrolyte interface, and effectively mitigating the growth of lithium dendrites are crucial for enhancing the performance of SSLMBs with high energy-density. Therefore, this paper reviews and analyzes the modification and structural design of PVDF-based SPEs from various aspects, and summarizes the methods to overcome the inherent defects of PVDF-based SPEs and improve their performance. Finally, based on existing literature, this paper provides an outlook on the research directions for the application of PVDF-based SPEs in SSLMBs.

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quantum battery with interactive atomic collective charging

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Physical Review A 2024年第3期110卷 032211页

作者： Dayang Zhang Shuangquan Ma Yunxiu Jiang Youbin Yu Guangri Jin Aixi Chen Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics

The collective charge of N two-level atoms interacting in an open system is investigated. In contrast to a no atomic dissipation quantum battery, the battery remains at a steady state after reaching the moment of full charge. Considering the interactions between atoms, we find that the energy storage of quantum batteries will be significantly enhanced with the increase of atomic repulsion, and the attraction between atoms will exacerbate the dissipation of batteries in the environment. We extend this conclusion to two-level batteries in the drive field and three-level atom quantum batteries. In addition, we also investigate the dissipative charging process of multiatom quantum batteries and find that the number of atoms during the charging process can to some extent affect the energy conversion efficiency during the charging process. Under extreme conditions, the inverse temperature β can disrupt the energy storage of the battery.

关键词： quantum correlations, foundations & formalism quantum foundations quantum measurements quantum thermodynamics

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Demonstration of irradiation-resistant 4H-SiC based photoelectrochemical water splitting

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Journal of Semiconductors 2024年第11期45卷 74-80页

作者： Yan Pei Wenhao Geng Lingbo Xu Can Cui Xiaodong Pi Deren Yang Rong Wang Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Silicon and Advanced Semiconductor Materials&School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Advanced Semiconductors&Zhejiang Provincial Key Laboratory of Power Semiconductor Materials and Devices HangzhouIn no-vation CenterZhejiang UniversityHangzhou 311200China

4H silicon carbide(4H-SiC)has gained a great success in high-power electronics,owing to its advantages of wide bandgap,high breakdown electric field strength,high carrier mobility,and high thermal *** the high carrier mobility and high stability of 4H-SiC,4H-SiC has great potential in the field of photoelectrochemical(PEC)water *** this work,we demonstrate the irradiation-resistant PEC water splitting based on nanoporous 4H-SiC arrays.A new two-step anodizing approach is adopted to prepare 4H-SiC nanoporous arrays with different porosity,that is,a constant low-voltage etching followed by a pulsed high-voltage *** constant-voltage etching and pulsed-voltage etching are adopted to control the diameter of the nanopores and the depth of the nanoporous arrays,*** is found that the nanoporous arrays with medium porosity has the highest PEC current,because of the enhanced light absorption and the optimized transportation of charge carriers along the walls of the nanoporous *** performance of the PEC water splitting of the nanoporous arrays is stable after the electron irradiation with the dose of 800 and 1600 k Gy,which indicates that 4H-SiC nanoporous arrays has great potential in the PEC water splitting under harsh environments.

关键词： 4H-SiC nanoporous arrays water splitting irradiation resistance photoanodes

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Two mass-imbalanced atoms in a hard-wall trap: Deep learning integrability of many-body systems

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Physical Review E 2024年第2期110卷 024129页

作者： Liheng Lang Qichen Lu C. M. Dai Xingbo Wei Yanxia Liu Yunbo Zhang Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics School of Physics and Astronomy

The study of integrable systems has led to significant advancements in our understanding of many-body physics. We design a series of numerical experiments to analyze the integrability of a mass-imbalanced two-body system through energy-level statistics and deep learning of wave functions. The level spacing distributions are fitted by a Brody distribution and the fitting parameter ω is found to separate the integrable and nonintegrable mass ratios by a critical line ω=0. The convolutional neural network built from the probability density images could identify the transition points between integrable and nonintegrable systems with high accuracy, yet in a much shorter computation time. A brilliant example of the network's ability is to identify a new integrable mass ratio 1/3 by learning from the known integrable case of equal mass, with a remarkable network confidence of 98.22%. The robustness of our neural networks is further enhanced by adversarial learning, where samples are generated by standard and quantum perturbations mixed in the probability density images and the wave functions, respectively.

关键词： Convolutional neural networks Integrable systems Statistical methods

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Oxygen vacancies modulating self-powered photoresponse in PEDOT:PSS/ε-Ga_(2)O_(3)heterojunction by trapping effect

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Science China(Technological Sciences) 2022年第3期65卷 704-712页

作者： LI Shan YUE JianYing LU Chao YAN ZuYong LIU Zeng LI PeiGang GUO DaoYou WU ZhenPing GUO YuFeng TANG WeiHua Laboratory of Information Functional Materials and Devices School of ScienceState Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China College of Electronic and Optical Engineering&College of Microelectronics National and Local Joint Engineering Laboratory for RF Integration and Micro-Packaging TechnologiesNanjing University of Posts and TelecommunicationsNanjing 210023China Center for Optoelectronics Materials and Devices&Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China

Can the modulation effect of charge-carrier transfer be inherited from a single layer to its heterojunction structure?Certainly,the answer is ***,we experimentally verify that the photodetection performance modulation effect of oxygen vacancy(Vo)is transmitted from theε-Ga_(2)O_(3)layer to the PEDOT:PSS/ε-Ga_(2)O_(3)(PGO)hybrid *** adopting the annealedε-Ga_(2)O_(3)films,whose Voconcentrations are remolded by annealing ambients,the constructed PGO photodetectors(PDs)demonstrate regulable self-powered *** the V_(o)defects decrease,the photodetection properties are effectively enhanced with a high photo-to-dark current ratio of 2.37×10^(7),an excellent on/off switching ratio of 6.45×10^(5),fast rise/decay time of 121/72 ms,a large responsivity of 67.9 m A/W,superior detectivity of 9.2×10^(13)Jones,an outstanding external quantum efficiency of 33.2%,and a high rejection ratio(R_(250)/R_(400))of 5.96×10^(6)at 0 V in PGO-O;*** better photoresponse is attributed to the less V_(o)defect concentration in theε-Ga_(2)O_(3)layer,which could favor the lower electron-trapping probability and a more efficient charge-carrier *** the universality of V_(o)defects in oxide materials,the proposed regulation strategy of photoresponse will open the route of high self-powered performance for next-generation ultraviolet PDs.

关键词： oxygen vacancy self-powered photodetector heterojunction PEDOT:PSS/ε-Ga2O3

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